I've got a Samsung GT-S5230 and have already got the correct settings, but still my internet is not working. someone help?
Double check against these instructions:
Switch the phone off and then on again afterwards.
looks like you have a data bar 😀
Have you checked signal coverage?
Check the settings for the app, they will need setting to the GiffGaff profiles.
Also make sure there are no settings hanging around for previous networks.
On the applications/games menu, click options (or More). Then click Connections. Then choose an app and choose giffgaff WAP.